13.4-Tb/s WDM Transmission over 1,280 km Repeated only with PPLN-based Optical Parametric Inline Amplifier

Inline-amplified 2.1-THz WDM transmission with the longest transmission distance of 1,280 km using OPA-based repeater only is demonstrated. Two-stage PPLN-based OPA offers sufficient gain to compensate losses of standard 80-km fibre span and optical gain equalizer for 640-Gb/s PDM-PS36QAM signals with 100-GHz-spaced 21-ch WDM configuration.